[pulseaudio-discuss] Revisiting 5.1/7.1 channel positions

Arun Raghavan arun at arunraghavan.net
Wed Dec 5 09:38:55 UTC 2018

Hey folks,
I've written up a quick analysis of the channel positions we currently support, and what I think makes sense:


The summary is that "Rear Left/Right" is currently being used in place of what should be "Left/Right Surround", and we do not have any channel  position between that position and "Rear Center", which is needed for common 7.1 configurations (what would be "Rear Left/Right Surround").

To add to this, the PulseAudio channelmap header is incorrect in that we say that "Side Left/Right" should correspond to Dolby "Surround Left/Right" when they are separate (they are further forward than "Surround Left/Right". Yhis can be corrected easily enough as it's just a documentation comment.

My proposal is to add a "Rear Left/Right of Center" position to represent the missing positions. At the ALSA level, it would correspond to RLC/RRC.

Any comments?


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